The presence of spirochetes in late seronegative syphilis.
D000328:Adult; D000368:Aged; D001082:Aqueous Humor / Q000382:microbiology; D001766:Blindness / Q000209:etiology; D002675:Child, Preschool; D002825:Chorioretinitis / Q000209:etiology; D005128:Eye Diseases / Q000473:pathology*; D005260:Female; D006732:Horner Syndrome / Q000473:pathology; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D008875:Middle Aged; D009494:Neurosyphilis / Q000473:pathology*; D010784:Photomicrography; D013588:Syphilis Serodiagnosis; D013590:Syphilis, Congenital; D014210:Treponema pallidum / Q000302:isolation & purification*